Question

7. In places of hot climate it is advised that the outer walls of houses be
painted white. Explain.
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Answer 1

Answer: Yes, because White reflects sunlight while black absorbs sunlight by which the house will be heated up and it will be very hot inside while if you paint white, the house will stay cool.

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Answer 2

Required Answer:

In places of hot climate it is advised that the outer walls of houses be painted white. This is because :–

• Smooth and light coloured paints reflect heat coming from the sun.
• Because of it, the house won't absorb heat and one wouldn't feel hot inside.
• Black and dark coloured paints absorb heat energy, thus one will feel more heat.
• That's why in hot climate, it is suitable to paint the outer walls with white paint.

Some more things to remember :

• Absorption and reflection of heat occurs due to radiation.
• The absorption and reflection of heat depends on the nature of the surface and the colour of the object.
• If surface is smooth & shiny and has light colours, then it will reflect heat.
• If surface is dark and has rough surface, then it will absorb heat.